Typewriting and like machines



April '14, 1942. R, G THQMPSQNY 2,279,802

TYPEWRITING AND LIKE MACHINE Filed' July 19, 1959 2 Sheets-Sheet 1 April 14, 1942. G: O P ON 2,279,802

TYPEWRITING AND LIKE MACHINE 2 Sheets-Sheet 2' Filed July 19, 1939 Patented Apr. 14, 1942 UNITED STATS PATENT OFFICE TYPEWRITING AND LIKE MACHINES Russell G. Thompson, West Hartford, Conn, es-

signor to Remington Rand Ind, Buflalo, N. Y., a corporation of Delaware Application July 19, 1939, Serial No. 285,369

3 Claims.

My invention relates to typewriting and like machines and is directed more particularly to providing substantially the same coefficient of expansion between two connected, relatively movable parts of the machine when one of said parts is made of an aluminum alloy and the other of said parts is made. of steel.

Aluminum alloy has a coeflicient of expansion of about twice that of ordinary steel. It has been found that when two relatively movable, pivotally united, parts of a typewriting machine-one made of an aluminum alloy and the other of ordinary steel-are employed, a setting of the pivotal connection to function freely at, say, room temperature will result in an undue binding of the pivotal connection when the machine'is subjected to a lower temperature, due to different coeflicients of expansion of the tw connected parts.

One of the main objects of the present invention, generally stated, is to overcome this difficulty and provide two such parts as those indicated above which have substantially'the same coefiicients of expansion.

To the above and other ends which will hereinafter appear, my invention consists of the features of construction, arrangements of parts and combinations of devices hereinafter described and particularly pointed out in the appended claims.

In the accompanying drawings, wherein like reference characters indicate corresponding parts in the different views:

Fig. 1 is a fragmentary, vertical, central, fore and aft sectional view showing a portion of a No. Remington Noiseless machine embodying my invention; the section being taken on the line ll of Fig. 3 and looking in the direction of the arrows at said line.

Fig. 2 is a side view, with parts in section, of a portion of the center tie connections of said machine.

Fig. 3 is a top plan view of the construction shown in Fig. 1 with parts sectioned away.

Fig. 4 is a detail sectional view taken on'the line 4-4 of Fig. 3 and looking in the clirection of the arrows at said line.

Fig. 5 is a detail, sectional view taken on the line 55 of Fig. 3 and looking in the direction of the arrows at said line.

Fig. 6 is an enlarged, detail sectional view taken on the line 6-6 of Fig. 3 and looking in the direction of the arrows at said line.

Fig. 7 is an enlarged, detail sectional view taken on the. line l -+1 of Fig. 3 and looking in the direction of the arrows at said line.

I have shown my invention embodied in the present instance in a No. 10 Remington Noiseless machine. It should be understood,- however, that the invention is not restricted to such embodiment but may be employed in various forms of typewriting and like machines wherever found available.

In the accompanying drawings I have shown only so much of the No. 10 Remington Noiseless machine as may be necessary to arrive at an understanding of my invention in its embodiment therein.

The machine shown in the present instance includes a carriage 8 carrying a platen 9 and having a guide rail I!) with oppositely disposed grooved ways therein. These ways receive antifriction crossed bearing rollers l I which also are received in oppositely grooved bearings in asupporting member I 2 mounted for case shifting movement. The carriage also coacts in the usual 'manner by means not shown, with an upstanding part 13 of a'supporting member M; the part l3 being located in the center of the machine in the rear of the printing point to resist the pressure of the type bars against the platen.

The carriage support l2 has attached thereto two depending brackets l 5, one near each sideof the machine. To the lower end of each bracket is attached a'coiled expansion spring It to partly counter-balance the weight of the carriage and the support l2 therefor. The upper end of each spring 16 is connected to a nut l1 threaded on a headed screw I8 received in an unthreaded opening in the support I4 and by which the tension of each spring l6 may be varied.

Two upstanding lugs I9 are formed integral with the supporting member l4 and each lug is tapped transversely to receive a hardened pivot screw 25!. The pointed bearing end of the left hand pivot screw is received in a bearing opening ina hardened steel plate or arm 2|. Said arm'is adjustably secured to a second hardened steel plate or arm 22 which is fixed to a rock shaft 23. Preferably the left hand end portion of said shaft is slabbed off at 24 and is received in a correspondingopening in the arm'22 so that said arm and shaft are fixedly united to turn together. The arm 22 may be brazed to the shaft 23 as indicated at 25.

I in a corresponding bearing or depression in the plate or arm 2|. Said cylindrical end 26 of the shaft and the bearing in the plate 2| in which it is received are concentric with the associated pivot screw 20 so that the arm 2| may receive an adjustment relatively to the plate 22 around the axis of the companion pivot screw 20. The means for effecting such adjustment of the arm 2|, and for holding it in its adjusted position relatively to the arm 22,comprises an eccentric 21 that is received in an elongated opening 28 in the arm 2| and has a hexagonal head 29 by which the eccentric may be turned around a headed clamping screw 3|] that is received in a.

tapped opening in the arm 22. Additional headed clamping screws 3| and 32 pass throughelonmechanism and is substantially such a construction as has heretofore been employed in the No.

gated openings 33 and 34 respectively'in the arm 2| and are received in tapped openings in the arm 22 to retain the arm 2| in its adjusted p0 .l

sition on the arm 22. Itwill be understood that ,1

due to the support of the arm 2| on the cylindrical end 26 of the shaft, and to the disposition of the slots 28, 33 and 34, a turning of the' eccentric 21 will effect aturning adjustment of the arm 2| around the pivotal axis of the companion pivot screw as a center when the clamping.

screws have been loosened. l

The arm 2| is provided with an off-set ear 2| that is tapped to receive a screw stop 2| which.

at its lower end coacts with a companion stop I face 21 on the support l4. These stops'coact to arrest the arms 2| and 22 and the shaft '23 in the movement thereof in one direction;

The other end of the shaft 23 has a hardened steel arm 35 fixedly secured thereto: in the samemanner as the arm 22. From a consideration of Fig; 5itwill be seen that a companion hard'' ened steel arm 36 has a bearing openingv therein to receive the companion pivot screw 20, andthat said arm 36 is adjustably secured to the arm 35 with the aid of two headed clamping screws 31' which extend through substantially} horizontally disposed elongated slots 38 in the arm 3|? and are received in tapped openings in the arm 35. Adjacent slots 39 are provided in the upper edges of the arms 35 and 36 to receive a screw driver. A twisting movement of the screw driver effects a slight horizontal adjustment of the arm 36 fore and aft of the machine relative to the arm 35 when the screws 31 are loosened. This adjustment of the shaft 23 brings the carriage support I2 and the front'face of the platen into a trued position at the right and left hand ends thereof and affords a proper alignmerit of'the carriage.

It will be seen that the rear end of each of 1 the arms 22' and 35' is pivotally connected at 4|] to a depending lugi 4| on the carriage support l2, whereas the forward end of the arm 2| is pivoted; at 42, to a depending link 43. Said link 43-may be connected in the usual manner (not shown) with two case shift keys, so that an actuation of each of said keys will rock the shaft 23 and effect a shifting movement of the carriage to whereas a fixed member 45'overlies a forward extension 46 on the member l4. The above-described adjustment of the member I4 is effected with the aid of a link-4l located centrally of the machine and' pivoted at 48 to saidinember.

- IORemington Noiseless machine.

Irr accordance with the present invention the support H is a die casting made from an aluminum alloy. In practice I have found that an aluminum alloy comprising 88% aluminum and 12% silicon by weight gives very good results although an alloy comprising 90% aluminum, 5% copper'and'5% silicon by weight may be employed. The coefficient of expansion of these and other aluminum alloys is about twice that of ordinary steel. Thus the aluminum die casting support M has a coefficient of expansion of .000022 per degree C'., whereas ordinary cold rolled steel has a coefficient of .000011 per degree C.

For various reasons, including undue wear thereon, it has been found to be undesirable to make the rock shaft of an. aluminum alloy so as to have the same coeflicient of expansion as the aluminum die casting l4. On the other hand it has been demonstarted in practicethat when the rock shaft 23 is'made of ordinary steel se-'- rious difficulties are encountered due to the differences in thecoefiicients of expansion of said shaft and the aluminum die casting I4; Thus,

expansion of when the shaft was set to be free for movement on its pivotal supports at ordinary room temperature and the typewriter was placed in operation in a lower temperature the aluminum con tracted more than the steel with the result that 4 the shaft unduly bound at its bearings rendering a readjustment necessary or desirable. It is one of the main objects of'my invention to overcome'thi's serious difliculty. I have found that Allegheny Steel No. 88 has the same coefficient of expansion as aluminum. This steel is nonmagnetic and mildly corrosion-resistant and contains 12 to 14% nickel, 5 to 7% manganese and less than 1% chromium. As far as I have been able to discover it is the only steel that has the same, or substantially the same, coefficient of expansion as aluminum alloy. In the present construction I make the of said Allegheny Steel No. 88 and thus pro vide the same coefficient of expansion of the shaft 23 and the aluminum die casting l4, thereby overcoming the difliculties pointed out above.

While I, have specifically described the embodiment of my invention in a No. 10 Remington Noiselessmachine and to the rock shaft 23 and member |4 thereof, obviously the invention is applicable to any typewriting or like machine has a sliding adjustment fore and aft of the" machine on an underlying fixed support '44;

in which two relatively movable pivotally united parts are employed and in which one of said parts is made of an aluminum alloy and the other is made of steel and it is desirable to tion without departing from my invention as it is defined in the accompanying claims.

rock shaft 23 What I claim as new and desire to secure by Letters Patent is:

1. In a typewriting machine the combination of two relatively movable interfitting parts, one of said parts being made of an alloy comprising 88 to 90% aluminum and the other part being i made of steel having substantially the same coefficient of expansion as said aluminum alloy part, said steel comprising 12 to 14% nickel, 5 to of expansion as the aluminum alloy of said support, and comprising 12 to 14% nickel, 5 to 7% manganese and less than 1% chromium.

3. In a case shift mechanism for typewriting machines, the combination of an aluminum alloy supporting member, hardened steel pivot bearings fixedly secured to said supporting member, and a hardened steel rock shaft arranged to fit snugly between said pivot bearings, said rock shaft being made of steel having the same coefficient of expansion as the aluminum alloy of said support to maintain said snug fit with the pivot bearings regardless of ambient temperature changes.

RUSSELL G. THOMPSON. 

